Whoo that's a pretty big house! It's pretty good in design, but I'm gonna nit-pick on the lines.
You see how on the doors and windows it's either straight or going up 1 pixel at a time? And for the most part the step is going up by 2 pixels at a time?
Those lines look wonderful! But on alot of other things there is a variation, and makes it look choppy. :c
I don't know if it's the choppy-ness or the placement of the sidewalk, but the acutal grass seems to warp down after it, pulling the whole picture into a weird warp and it looks bad. Last, the little...clumpies (on the house siding and the side of the bricks in the garden set off) where you get some extra pixels look bad.
But overall it is a good design that can be easily fixed into some straighter lines that are much more pleasing.